Pics sure help us figure it out better, but I realize that's not always possible...
What you're describing can be a few things, and let's hope it's something easy. They may have compounded or wetsanded the car before it was cured enough, and this can cause "die back" or a dulling in the paint, in certain areas (or all over). If they had to correct a few areas where debris or such got on the fresh paint, they would have had to compound or wetsand those places. This is easily remedied via some compound & polish once the paint has hardened (should be by now) You may want to try that yourself, - use some medium grit polish like 3M Finesse-It F/M or even a cheapie product like KIT Scratch-Out on the area(s) and see what happens. If that clears it up , you're done.
The one other thing that comes to mind is worse, called "solvent pop", and unfortunately, there's nothing you can do about that except repaint. It makes the paint look "foggy" when it happens. It occurs when solvent (thinners/reducers) becomes "trapped" in the paint film at the time when the surface layer skins over too fast, preventing their evaporation into the atmosphere, and it leaves microscopic whitish pinholes in the clear as the solvents push through to the surface.
If the shop used the wrong temp reducers/activators (too fast ) for the ambient conditions, or didn't allow the correct "flash times' between coats, then it can happen.
I hope it's not that.
They could also have used some type of solvent on the not fully cured paint in some places, creating the dulling. The abrasive route should fix that as well. Best of luck.